Cells Biology

3. organic substances secreted by plants and animals that regulate various physiological activities and maintain homeostasis.
4. is a molecule that serves as the primary energy carrier in cells.
6. a catalyst that regulates the rate at which chemical reactions proceed
9. a collection of tissues that structurally form a functional unit, specialized to perform a particular function.
10. the basic membrane-bound unit that contains the fundamental molecules of lif
11. process by which biological systems tend to maintain stability.
12. a group of structurally and functionally similar cells and their intercellular material.
13. the smallest unit of matter that has the characteristic properties of a chemical element

1. is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy
2. a group of two or more atoms held together by attractive forces known as chemical bonds
5. detectable change (physical or chemical) in the environment of an organism that results in some functional activity
7. are responsible for generating energy for the cell through aerobic respiration.
8. A chemical element is a substance that cannot be broken down